SG6901A Fairchild Semiconductor, SG6901A Datasheet
SG6901A
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SG6901A Summary of contents
Page 1
... PFC loop, in which the overshoot and undershoot of the PFC voltage are clamped. If the feedback loop is broken, the SG6901A shuts off PFC to prevent extra-high voltage on output. Programmable two-level output voltage control reduces the PFC output voltage at low line input to increase the efficiency of the power supply ...
Page 2
... PFC / Flyback PWM Controller www.DataSheet4U.com MARKING DIAGRAMS SG6901A TP XXXXXXXXYWWV ORDERING INFORMATION Part Number Pb-Free SG6901ASZ © System General Corp. Version 1.0.1 (IAO33.0062.B0) PIN CONFIGURATION T: S=SOP P : Z=Lead Free Null=regular package XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location Package 20-pin SOP - 2 - Product Specification SG6901A www.sg.com.tw • ...
Page 3
... An external NTC thermistor must be connected from this pin to ground. The impedance of the NTC thermistor decreases whenever the temperature increases. Once the voltage of the OTP pin drops below the OTP threshold, the SG6901A is disabled. This is the output of the PFC current amplifier. The signal from this pin is compared with an internal sawtooth and determines the pulse width for PFC gate drive ...
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... PFC / Flyback PWM Controller www.DataSheet4U.com BLOCK DIAGRAM © System General Corp. Version 1.0.1 (IAO33.0062.B0) Product Specification - 4 - www.sg.com.tw • www.fairchildsemi.com SG6901A September 26, 2007 ...
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... DD Oscillator Section Symbol Parameter F PWM Frequency OSC R RI Pin Resistance Range I RI Pin Open Protection RI OPEN If R > SG6901A Turns Off I open RI Pin Short Protection RI SHORT If R < SG6901A Turns Off I short © System General Corp. Version 1.0.1 (IAO33.0062.B0) < 50°C A Test Conditions 0V < ...
Page 6
... Test Conditions Min. Typ 1 +1. 3.2 R =24KΩ (I =20+I •0. 0. www.sg.com.tw • www.fairchildsemi.com Product Specification SG6901A Max. Unit 0. RMS-UVP 0. UVP-Min ms 4 240 ms 2.00 V 1.65 V 200 ms 0 Max. Unit 3. KΩ 3.30 V 120 mV 120 µ ...
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... Test Conditions V =20V DD V =15V; I =100mA =13V; I =100mA =15V; C =5nF O/P= =15V; C =5nF O/P= Test Conditions - 7 - Product Specification SG6901A Min. Typ. Max. Unit 90 100 110 µA 0.15 0.20 0.25 V 0.35 0.40 0.45 V 200 ns 270 350 450 ns Min. Typ. Max. Unit 0 360 µA 250 µ ...
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... Test Conditions Min. Typ. R =24KΩ 90 100 I 1.35 1.40 1.15 1.20 8 Test Conditions Min. Typ. R =24KΩ 470 - 8 - www.sg.com.tw • www.fairchildsemi.com SG6901A Max. Unit 120 ns 0.75 V 0.70 V 450 ns 0.55 V Max. Unit 120 ns 110 Max. Unit 110 µA 1 ...
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... Temperature 25.5 25.1 24.7 24.3 23.9 23 110 125 -40 ℃ Product Specification SG6901A Minimum Operating Voltage ( Temperature -25 - 110 Temperature ( ) ℃ PWM Frequency ( Temperature 110 ...
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... 110 110 125 -40 -25 ) ℃ Product Specification SG6901A Reference V oltage ( Temperature - 110 Temperature ( ) ℃ Ris ing Time ( Temperature - ...
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... 120 102 110 125 -40 - Product Specification SG6901A L IMIT -1 vs Temperature - 110 Temperature ( ) ℃ LIM IT -2 Temperature -25 - 110 Temperature ( ) ℃ ...
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... M AXP WM 1.25 1.23 1.21 1.19 1.17 1.15 -40 - 110 125 ℃ Product Specification SG6901A PWM Maximum Duty C ycle ( AXPW M Temperature - 110 Temperature ( ) ℃ OTP Thres hold Voltage ( Temperature ...
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... VRMS pin. The V voltage is used for the PFC multiplier, brownout protection, and range control. For brownout protection, the SG6901A is disabled with 195ms delay time if the voltage V For PFC multiplier and range control, refer to section below for more details. ...
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... PFC / Flyback PWM Controller www.DataSheet4U.com Interleave Switching The SG6901A uses interleaved switching to synchronize the PFC and flyback stages, which reduces switching noise and spreads the EMI emissions. Figure 3 shows off-time inserted between the turn-off of the PFC OFF gate drive and the turn-on of the PWM. ...
Page 15
... OPFC is disabled. THE OPFC is not enabled again until the OVP voltage falls below OVP Cycle-by-Cycle Current Limiting SG6901A provides cycle-by-cycle current limiting for both PFC and PWM stages. Figure 6 shows the peak current limit for the PFC stage. The PFC gate drive is ...
Page 16
... FBPWM is clamped by the SS voltage during PD-PWM start-up. In the event of a protected condition and/or PWM disabled, the SS pin quickly discharges. Gate Drivers SG6901A output stage is a fast totem-pole gate driver. The output driver is clamped by an internal 18V Zener diode to protect the external power MOSFET Product Specification SG6901A (4 ...
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... Product Specification SG6901A Detail θ L Detail A Typ. Max. 0.104 0.012 0.092 0.016 0.008 0.508 0.299 0.050 0.419 0.050 ° 0.020X45 0.004 8° ...
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... PFC / Flyback PWM Controller www.DataSheet4U.com © System General Corp. Version 1.0.1 (IAO33.0062.B0) Product Specification - 18 - www.sg.com.tw • www.fairchildsemi.com SG6901A September 26, 2007 ...